Dielectric properties of some low-lead or lead-free perovskite-derived materials: Na0.5Bi0.5TiO3–PbZrO3, Na0.5Bi0.5TiO3–BiScO3 and Na0.5Bi0.5TiO3–BiFeO3 ceramics |
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| Affiliation: | 1. SPCTS (UMR CNRS 7315), ENSCI, CEC, 12 rue Atlantis, 87068 Limoges, France;2. Air Liquide, Centre de Recherche Claude-Delorme, 1 chemin de la porte des Loges, Les Loges-en-Josas B.P., 126-78354 Jouy-en-Josas Cedex, France;1. Inner Mongolia Key Laboratory of Ferroelectric-related New Energy Materials and Devices, School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Key Laboratory of Instrumentation and Dynamic Measurement of Ministry of Education, School of Instrument and Electronics, North University of China, Taiyuan, Shanxi 030051, China |
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| Abstract: | Na0.5Bi0.5TiO3 (NBT) and its modifications are known to be new lead-free ferroelectric materials and are promising for environment friendly devices. The systems under investigation were (i) NBT (trigonal/ferroelectric)–PbZrO3 (orthorhombic/antiferroelectric); (ii) NBT (trigonal/ferroelectric)–BiScO3 (trigonal/paraelectric); and (iii) NBT (trigonal/ferroelectric)–BiFeO3 (trigonal/antiferromagnetic).The lattice parameters change as expected from the respective ionic radii values. For NBT–PZ, the dielectric permittivity shows a large frequency and temperature dispersion suggesting a relaxor-like behaviour dependent on the thermal annealing of the samples. For NBT–BS, the Curie temperature increases with BS content as well as the diffuseness of the phase transition, connected with the introduced disorder. For NBT–BF, the overall behaviour of the permittivity of NBT is maintained up to 50% BF but anomalies of the permittivity appeared close to 600 °C, which might be connected with the onset of magnetic influence for high BF content. |
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